Net credit sales for the month are $800,000. The accounts receivable balance is $160,000. The allowance is calculated as 7.5% of the receivables balance using the percentage-of-receivables basis. If Allowance for Doubtful Accounts has a credit balance of $5,000 before adjustment, what is the balance after adjustment?

(a) $12,000.

(b) $7,000.

(c) $17,000.

(d) $31,000.